It depends on how you have it set up. For KDE Desktop, you go into system, system settings, advanced, power management. You can play around with the settings there. You have a choice of suspending to RAM or Disc. I'm not sure what the best choice is for your machine.
For me, recovery for RAM is doesn't really work very well and recovery from Disc is kind of slow compared to Windows 7.
Intel DP35DP MB; Nvidia 440 2 gig Video Card; 8 gigs of ram; Intel Core 2 Quad 2.83 gig; Hp Officejet Pro L7580; LVM F23 64bit using 2 320g HDs and dual monitors.